Your review is good, the film however not so good. If the point of the film as you say is to teach altruism, how are the aliens teaching altruism to the humans by having them kill each other? If no one who has undergone the experiments is allowed to "warn" another test subject not to push the button because of the consequences then how would anyone learn that they should choose altruism? You see here is the real problem with the movie, the obvious plot holes and it just doesn't make sense if you look at the story closely. Though I understand and I think everyone understands your point about the "golden rule" and on the surface that is what this film is portraying yet that is so simplistic and shallow and doesn't need to be a 2-hour film.
If everyone didn't push the button, we'd all be in good shape. Of course, but then why have the other odd consequences for those that do push the button? What results are these alien experiments hoping to accomplish? These questions simply aren't answered in the film. On the commentary at one point the director says the aliens are conducting experiments to see if humans are worthy of continuing or if they will simply be wiped-off Earth. Yet later in the commentary he says that the aliens offer salvation to the spouses that are killed, insinuating that it is better after death. That right there doesn't make any sense. If the aliens are capable of offering salvation to the humans that is superior to the human experience then why conduct experiments to see if humans are altruistic?
Rather than raising interesting philosophical questions the film just had huge plot holes, inconsistencies and contradicts itself. But I thought it was suspenseful so I gave it 3-stars.